Riain,
Your figures about Turkish production are grossly inaccurate;according to Food and Agriculture Organization of the United Nations (FAO) Greece is in 14th position,Bulgaria is in 16th,Serbia is in 22nd and Turkey is in place...35
with considerably less than 10% of the Greek production.The last list published was April 2012 and it is the most recent one.
Byzantion would have been one of the top world producers since a strong Byzantine Empire surviving would have greatly limited Italian and especially French production;Through the Greek city of Massalia in southern France were exported up the river Rhone to Gaul more than ten million litres of wine per year in ancient times;Medieval western Europe imported great quantities of the first rate Greek wines from Athens Chios,Lemnos,Samos,Monemvasia,Laconia and Nemea.Byzantion with Greece as its principal producer,would have exported quality wines from 300 original varieties of wine producing grape vines
a greater variety and quality than any other country in the word and that is what it counts:quality.Original varieties by analogy is the difference between Malt and Blend whiskies...
France would have limited production because they wouldn't have the Grape vines that they took back due to the Latin Empire...
Southern Italy belonged to Byzantion and is the largest producing area in Italy...
last comment,the production of the Greek wine producing areas would have increased greatly if they woldn't have had the desruction from wesstern raids that regressed its production for hundreds of years...
What figure is grossly inaccurate? The Wiki wine production list has Turkey at 35th with less than 10% of Greek production, however the Wiki list on grape production has Turkey right up there with France in terms of planted acres but a bit below France in terms of tonnage. Presumably, since Turkey is such a minor wine producer, these are table grapes, raisins and the like. I'm no viticulturist but I'd assume that where you can grow table grapes you can grow wine grapes, so this a chunk of this Turkish production could be of wine varietals in a surviving Byzantine TL.